In case it might be helpful to anyone else now or in the future,
here's a solution to a problem:
On my Debian 7/Wheezy system, one user could play a Vimeo piece
with sound, but another user got silence for the same piece. The
second user also had silence for some Google logos that allegedly
had sound for other people. The key difference was the use of
the 'plug' feature in the users' .asoundrc files. The following
diff/patch got sound working for the second user. My guess is
the Vimeo player produces a specific sample rate (or perhaps
other format attribute) and adding the 'plug' feature causes ALSA
to do the necessary conversion.
--- ../../.asoundrc.~1~ 2011-08-19 21:23:33.894407686 -0700
+++ ../../.asoundrc 2016-01-03 15:15:12.271767959 -0800
@@ -1,6 +1,9 @@
pcm.Intel { type hw; card Intel; }
ctl.Intel { type hw; card Intel; }
pcm.NVidia { type hw; card NVidia; }
ctl.NVidia { type hw; card NVidia; }
-pcm.!default pcm.Intel
+pcm.!default {
+ type plug
+ slave.pcm "Intel"
+}
ctl.!default ctl.Intel
HTH
Robert
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